Ultralong Dispersion-Shifted Erbium-Doped Fiber Amplifier and Its Application to Soliton Transmission

Masataka Nakazawa, Yasuo Kimura, Kazunori Suzuki

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


Distributed, dispersion-shifted erbium-doped fiber amplifiers with doping concentrations as low as 0.1-0.5 ppm (0.1-0.5 x 10-4 wt%) have been fabricated and their gain characteristics studied for the purpose of soliton amplification for the first time. A 9.4 km dual-shape-core type amplifier with a 0.5 ppm concentration has a gain of more than 20 dB at 1.535 μm and 10 dB at 1.552 μ m with a forward pumping configuration, and can successfully amplify and transmit a 20 ps soliton pulse train at 2.5 GHz repetition rate. Soliton transmission characteristics of an 18.2 km long fiber amplifier are studied using backward and forward pumping. It is found that A = 1.5 soliton pulses with a pulsewidth of 20 ps can be amplified over 18.2 km at a repetition rate of 5 GHz, where soliton narrowing to 16 ps is observed.

Original languageEnglish
Pages (from-to)2103-2108
Number of pages6
JournalIEEE Journal of Quantum Electronics
Issue number12
Publication statusPublished - 1990 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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